soc/intel/xeon_sp/cpx: Calculate number of threads based on sockets

Assuming given system is populated with multiple CPUs of same SKUs,
calculate number of threads based on MAX_SOCKET.

This is a stop gap solution until proper way of identifying total
number of sockets is determined.

Change-Id: I7ebad3d57c47b9eeb7d727ffb21bc0a1a84734fd
Signed-off-by: Andrey Petrov <anpetrov@fb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40671
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Maxim Polyakov <max.senia.poliak@gmail.com>

src/soc/intel/xeon_sp/cpx/cpu.c

@@ -63,7 +63,14 @@ static int get_thread_count(void)
 
 	cpu_read_topology(&num_phys, &num_virts);
 	printk(BIOS_SPEW, "Detected %u cores and %u threads\n", num_phys, num_virts);
-	return num_virts;
+	/*
+	 * Currently we do not know a way to figure out how many CPUs we have total
+	 * on multi-socketed. So we pretend all sockets are populated with CPUs with
+	 * same thread/core fusing.
+	 * TODO: properly figure out number of active sockets OR refactor MPinit code
+	 * to remove requirements of having to know total number of CPUs in advance.
+	 */
+	return num_virts * CONFIG_MAX_SOCKET;
 }
 
 static const struct mp_ops mp_ops = {